Arduino Nano, $10.99, http://www.amazon.com/Arduino-ARD-NANO30-Nano-v3-0/dp/B003YVL34O

MLX90614ESF-DCI, 5v, 10ºFOV, $38, http://www.futureelectronics.com/en/Technologies/Product.aspx?ProductID=MLX90614ESFDCIMELEXIS3003055
Resistors [4.7k, 4.7k], $0.25

MCP73831, $0.90, http://au.mouser.com/ProductDetail/Microchip-Technology/MCP73831-2ACI-MC/?qs=sGAEpiMZZMsfD%252bbMpEGFJU1mdYbvapW5%252bZ%252bT/qNdFc8=
Resistors [2k, 470]
Li-Ion battery, single cell, $11.95, https://www.sparkfun.com/products/339
SOT23 to DIP adaptor, $0.95, https://www.sparkfun.com/products/717

LEDs [2x], $0.35, https://www.sparkfun.com/products/533

HC-SR04 Ultrasonic Rangefinder, $3.50, http://www.elecfreaks.com/store/hcsr04-ultrasonic-sensor-distance-measuring-module-p-91.html

Electromagnet, [probably going to have to make]
Mosfet, $0.95, https://www.sparkfun.com/products/10213
Diode, $0.15, https://www.sparkfun.com/products/10926

Switch, $3.50 [not cheapest option], https://www.sparkfun.com/products/9350

Glove